Argument '5' in CALCULATE function is required

Hi GraceTCL ,

You have a comma after the last Date ISO YEAR you need to take it.

formula corrected below:

GMV LW =
VAR CurrentYear =
    IF ( HASONEVALUE ( 'Date'[ISO Year] ), VALUES ( 'Date'[ISO Year] ) )
VAR CurrentWeek =
    IF ( HASONEVALUE ( 'Date'[ISO Weeknumber] ), VALUES ( 'Date'[ISO Weeknumber] ) )
VAR LastWeekPY =
    CALCULATE (
        MAX ( 'Date'[ISO Weeknumber] ),
        ALL ( 'Date' ),
        'Date'[ISO Year] = CurrentYear - 1
    )
VAR Result =
    IF (
        CurrentWeek = 1,
        CALCULATE (
            [GMV USD],
            ALL ( 'Date' ),
            'Date'[ISO Weeknumber] = LastWeekPY,
            'Date'[ISO Year] = CurrentYear - 1
        ),
        CALCULATE (
            [GMV USD],
            ALL ( 'Date' ),
            'Date'[ISO Weeknumber] = CurrentWeek - 1,
            'Date'[ISO Year] = CurrentYear
        )
    )
RETURN
    result